19. (D)
Question Type: Assumption
The core is:
Pros make team owners big money, so owners who are willing pay them big salaries. -->
The pros’ salaries are fair.
We are asked for the sufficient assumption"”that which, if true, would make this argument work. We need to link the key terms in our premises with the term "fair" in the conclusion, because right now, it isn’t clear why just because someone is willing to pay a certain salary, that salary is fair. (D) does this:
Pros make team owners big money, so owners who are willing pay them big salaries. -->
(Any salary that a team owner is willing to pay for the services of a professional athlete is a fair salary.) -->
The pros’ salaries are fair.
(A) tells us that the fairest economic system is one in which most goods and services are based on free market values. That doesn’t go as far as we would need"”most may not include professional athlete’s salaries. Furthermore, even in the fairest economic system, couldn’t there still be some unfair salaries? We aren’t concerned with what the fairest economic system is, but with whether these particular salaries are fair.
(B) is incorrect. If we knew that paying the pros less would mean the teams would make less, what would that tell us about how to determine whether the salaries are fair? We still don’t know what fair is based on with this answer choice.
(C) is incorrect. Again, it tells us nothing about why the salaries are fair just because people are willing (or are forced) to pay them.
(E) is incorrect and trying to fool you with reverse logic. Our critical missing piece is: willing to pay --> fair (if one is willing to pay it, it’s fair). It is not: fair-->willing to pay.
#officialexplanation